Part 8

6. What is the nature of the rocks belonging to the Aërial or Eolian group?

7. Give an example of a chemically formed rock.

8. Give examples of organically derived rocks.

9. What kinds of rocks are embraced by the Metamorphic class?

10. What are igneous rocks?

12. What is the mineralogical composition of granite?

13. What is meant by a mineral?

14. Name five minerals which do not contain oxygen. Where does fluor-spar occur? What is the element that enters most largely into the composition of the earth's crust?

15. Name the forms under which the mineral quartz occurs. Name some of the oxides of iron. What is iron pyrites?

16. Name two sulphates. Name two carbonates. Name some of the silicates. In what kinds of rock is augite found? Where does it never occur? In what kinds of rock does hornblende usually occur? Mention three species of felspar. What is one of the most distinguishing characteristics of mica? Name three silicates of magnesia. Mention some of their distinguishing peculiarities. Where do zeolites commonly occur?

17. What is a quartzose conglomerate? What is a calcareous conglomerate?

18. What is grit? What is freestone? To what are the various colours of sandstone due? What is shale?

19. Name some typical Eolian rocks, and tell where they occur.

20. How do stalactites and stalagmites occur? What is siliceous sinter, and how does it occur? How does rock-salt occur?

21. Mention some of the varieties of limestone. What is cornstone? What is the composition of dolomite?

22. Name some of the varieties of coal.

23. What is quartzite?

24. Describe clay-slate.

25. Mention some altered limestones.

26. What are schists? Name and give the mineralogical composition of three schists.

27. What is the general character of metamorphic rocks?

28. How would you classify granite?

29. What is the mineralogical composition of syenite and diorite?

30. How do we distinguish the two groups into which igneous rocks are subdivided? What is meant by the terms amygdaloidal and porphyritic?

31. Name some rocks that belong to the acidic group. What is quartz-porphyry?

32. Give examples of augitic igneous rocks. Name a hornblendic igneous rock.

33. What are fragmental igneous rocks? What is the difference between trappean breccia and trappean conglomerate?

34. What is meant by the terms stratum, strata, and stratified? What is the difference between lamination and bedding? What is a section?